Dumping mechanism for drag-line excavators.



APPLICATION FILED MAY 13, 1912.

Patented June 9, 1914.

2 SHEETS-SHEET 1.

W. FERRIS, & L. WBHNER. DUMPING MECHANISM FOR DRAG LINE EXGAVATORS.

APPLIOATION FILED MAY 13, 1912. gg Patented June 9, WM.

2 SHEETSSHEET 2.

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ID'UMPING MECHANISM FOR DBAG-LINE EKUAVdTOTtS.

aces.

Specification of Letters Patent.

Patented June 9, 31914.,

Application filed May 13, 1912. Serial No. 696,807.

To all whom it may concern Be 1t known that we, WALTER Fannie, a

citizen of the United States, residing at South Milwaukee, in the county of Milwaukee and State of Wisconsin, and LOUIS WnHnnn, a citizen of the United States, residing at Evansville, in the county of Vanderburg and State of Indiana, have invented a certain new and useful improvement in Dumping Mechanism for Drag-Line EX- cavators, of which the following is a specification.

Uur invention relates to improvements in dumping mechanism for drag line excavators and is illustrated in the accompanying drawings, wherein- Figure 1 is an elevation showing the bucket in the excavating position; Fig. 2 a similar elevation showing the bucket in the hoisting position; Fig. 3a plan view of the dumping mechanism; Fig. 4 a similar plan view of Fig. 3 in a modified form.

Like parts are indicated by the same letter in all the figures. I

The excavator boom or derrick A, which is supported from an excavating carriage or car not shown, carries the return sheave A and the dumping drum A The bucket A is provided with the bail A pivotally attached thereto and supported by the sheave A. and is provided with the handle A. The dumping rope A is attached to the handle A and is wound about the drum A", being fastened thereto at its inner end as indicated. The hoisting rope A is wound about the drum A in the opposite direction from the rope A and has one end fastened thereto. The arrangement of the two ropes is such that as the drum rotates, one is paid off and the other wound upon the drum and vice versa. The rope A passes over the drum A down over the sheave A up over the sheave A and thence to the hoisting engine not shown. The drum A is provided with the brake drum B rigidly attached thereto. The brake band B is rigidly attached at one end to the boom A, passes around the brake drum B and is pivotally attached at its other end to the bell crank lever B which is pivotally mounted on the boom A. The controlling link connection B may be actuated by the operator from the controlling platform not shown to rock the bell crank lever B, thus tightening the belt or band B around the brake drum B. The spring B connected at one end to the link B pivoted to the bell crank lever B and at the other end to the link B pivoted on the boom is adapted yieldingly to hold the bell crank in the inoperative position, thus permitting the drum to rotate normally free from interference.

in the modified form indicated in Fig. t, the drum C, having the dividing flange C is substituted for the drum A In this form the flange C separates the ropes A A Where they are wound upon the drum and prevents their coming in contact one with the other..

It will be evident that while we have shown in our drawings an operative device, still many changes might be made in v the size, shape and arrangement of the parts without departing materially from the spiritof our invention and we wish, therefore, that our drawings be considered as diagrammatic. The use and operation of our invention are as follows :-When the bucket is to be used for excavating, it is thrown out and dropped upon the ground in such manner that the cutting edge is in contact with the material to be excavated. The hoisting rope is then drawn in and the bucket is drawn for- Ward by means of the handle. The angularity of this handle is such that the bucket will enetrate the soil and fill itself. When the ucket is filled, the excavating rope is loosened and the hoisting mechanism is put into operation to lift the bucket. The pivotal point of the hoisting bail is so disposed with respect to the weight of the bucket and contents that the bucket when hoisted assumes the position indicated in Fig. 2. The drawing in of the hoisting rope lifts the rearmost end of the bucket by means of the bail. This causes the center of gravity of the load to shift toward the pivotal point of bail, making the pull on hoisting rope A enough greater than the pull on dumping rope A to cause the rope A to unwind from the dumping drum, thus causing the dumping rope A to wind upon the drum and thereby lift the bucket to the desired height without further tilting. 'W hen the bucket is'to be dumped, the brake on the dumping drum is tightened and the rotation of this drum is stopped. There is then no tendency for the ment, the rear end of the bucket is lifted until it is tilted into such a position that the contents are dropped out of the bucket. In case sticky materials have been excavated and the bucket will not free itself by gravity, the hoisting mechanism is operated to lift itup to a considerable height. It is then dropped through a few feet, jerking the material out, the strain of the stopping of the descent being carried partly by the braking mechanism on the dumping drum and partly by the braking mechanism at the other end of the cable'on the hoisting machinery not shown. In the modified form the lengths of cable as they are hauled in or paid out from the dumping drum, ar'e'sep'arated by the flange which prevents any possibility of their tangling or wrapping one around the other and prevent any undue wear or other difficulty.

We claim: In a drag line excavator a combined hoisting and dumping rope made up of two separate consecutive portions, one of them a dumping portion, the other a hoisting portion, wound around a drum in opposlte directions and fastened rigidly thereto at their ends, a bucket,'the, free end of the dumping portion being fastened thereto, a sheave on the bucket about which the hoisting portion travels and means for drawing in the free end of the hoisting portion to unwind the hoisting portion from the drum and wind the dumping portion upon the drum to raise the bucket, and means for holding the drum against rotation without interrupting the movement of the hoisting portion about the sheave to dump the bucket.

' WALTER FERRIS. LOUIS WEHNER. Witnesses as to the signature of Walter Ferris:

R. Soo'rr,

L. A. CHRISTENSEN.

Witnesses as to the signature of Louis Wehner:

THOMAS MACER,

F. W. KINGSBURY. 

